What is the purpose of the JSON extractor in JMeter |

The JSON Extractor is a post-processor in JMeter used to extract data from JSON responses. It allows you to extract data from a JSON object and store it in a JMeter variable for later use in subsequent requests. This is particularly useful when testing REST APIs that return JSON responses. You can extract values from the JSON response using JSONPath expressions and store them in variables for use in subsequent requests or for assertions. The JSON Extractor can also handle complex JSON structures with nested objects and arrays. Overall, the JSON Extractor simplifies the process of extracting data from JSON responses and using it in subsequent requests or assertions in JMeter.